drivers/dma/qcom/hidma.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Qualcomm Technologies HIDMA data structures
   4  *
   5  * Copyright (c) 2014-2016, The Linux Foundation. All rights reserved.
   6  */
   7
   8 #ifndef QCOM_HIDMA_H
   9 #define QCOM_HIDMA_H
  10
  11 #include <linux/kfifo.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/dmaengine.h>
  14
  15 #define HIDMA_TRE_SIZE                  32 /* each TRE is 32 bytes  */
  16 #define HIDMA_TRE_CFG_IDX               0
  17 #define HIDMA_TRE_LEN_IDX               1
  18 #define HIDMA_TRE_SRC_LOW_IDX           2
  19 #define HIDMA_TRE_SRC_HI_IDX            3
  20 #define HIDMA_TRE_DEST_LOW_IDX          4
  21 #define HIDMA_TRE_DEST_HI_IDX           5
  22
  23 enum tre_type {
  24         HIDMA_TRE_MEMCPY = 3,
  25         HIDMA_TRE_MEMSET = 4,
  26 };
  27
  28 struct hidma_tre {
  29         atomic_t allocated;             /* if this channel is allocated     */
  30         bool queued;                    /* flag whether this is pending     */
  31         u16 status;                     /* status                           */
  32         u32 idx;                        /* index of the tre                 */
  33         u32 dma_sig;                    /* signature of the tre             */
  34         const char *dev_name;           /* name of the device               */
  35         void (*callback)(void *data);   /* requester callback               */
  36         void *data;                     /* Data associated with this channel*/
  37         struct hidma_lldev *lldev;      /* lldma device pointer             */
  38         u32 tre_local[HIDMA_TRE_SIZE / sizeof(u32) + 1]; /* TRE local copy  */
  39         u32 tre_index;                  /* the offset where this was written*/
  40         u32 int_flags;                  /* interrupt flags                  */
  41         u8 err_info;                    /* error record in this transfer    */
  42         u8 err_code;                    /* completion code                  */
  43 };
  44
  45 struct hidma_lldev {
  46         bool msi_support;               /* flag indicating MSI support    */
  47         bool initialized;               /* initialized flag               */
  48         u8 trch_state;                  /* trch_state of the device       */
  49         u8 evch_state;                  /* evch_state of the device       */
  50         u8 chidx;                       /* channel index in the core      */
  51         u32 nr_tres;                    /* max number of configs          */
  52         spinlock_t lock;                /* reentrancy                     */
  53         struct hidma_tre *trepool;      /* trepool of user configs */
  54         struct device *dev;             /* device                         */
  55         void __iomem *trca;             /* Transfer Channel address       */
  56         void __iomem *evca;             /* Event Channel address          */
  57         struct hidma_tre
  58                 **pending_tre_list;     /* Pointers to pending TREs       */
  59         atomic_t pending_tre_count;     /* Number of TREs pending         */
  60
  61         void *tre_ring;                 /* TRE ring                       */
  62         dma_addr_t tre_dma;             /* TRE ring to be shared with HW  */
  63         u32 tre_ring_size;              /* Byte size of the ring          */
  64         u32 tre_processed_off;          /* last processed TRE             */
  65
  66         void *evre_ring;                /* EVRE ring                       */
  67         dma_addr_t evre_dma;            /* EVRE ring to be shared with HW  */
  68         u32 evre_ring_size;             /* Byte size of the ring           */
  69         u32 evre_processed_off;         /* last processed EVRE             */
  70
  71         u32 tre_write_offset;           /* TRE write location              */
  72         struct tasklet_struct task;     /* task delivering notifications   */
  73         DECLARE_KFIFO_PTR(handoff_fifo,
  74                 struct hidma_tre *);    /* pending TREs FIFO               */
  75 };
  76
  77 struct hidma_desc {
  78         struct dma_async_tx_descriptor  desc;
  79         /* link list node for this channel*/
  80         struct list_head                node;
  81         u32                             tre_ch;
  82 };
  83
  84 struct hidma_chan {
  85         bool                            paused;
  86         bool                            allocated;
  87         char                            dbg_name[16];
  88         u32                             dma_sig;
  89         dma_cookie_t                    last_success;
  90
  91         /*
  92          * active descriptor on this channel
  93          * It is used by the DMA complete notification to
  94          * locate the descriptor that initiated the transfer.
  95          */
  96         struct hidma_dev                *dmadev;
  97         struct hidma_desc               *running;
  98
  99         struct dma_chan                 chan;
 100         struct list_head                free;
 101         struct list_head                prepared;
 102         struct list_head                queued;
 103         struct list_head                active;
 104         struct list_head                completed;
 105
 106         /* Lock for this structure */
 107         spinlock_t                      lock;
 108 };
 109
 110 struct hidma_dev {
 111         int                             irq;
 112         int                             chidx;
 113         u32                             nr_descriptors;
 114         int                             msi_virqbase;
 115
 116         struct hidma_lldev              *lldev;
 117         void                            __iomem *dev_trca;
 118         struct resource                 *trca_resource;
 119         void                            __iomem *dev_evca;
 120         struct resource                 *evca_resource;
 121
 122         /* used to protect the pending channel list*/
 123         spinlock_t                      lock;
 124         struct dma_device               ddev;
 125
 126         struct dentry                   *debugfs;
 127
 128         /* sysfs entry for the channel id */
 129         struct device_attribute         *chid_attrs;
 130
 131         /* Task delivering issue_pending */
 132         struct tasklet_struct           task;
 133 };
 134
 135 int hidma_ll_request(struct hidma_lldev *llhndl, u32 dev_id,
 136                         const char *dev_name,
 137                         void (*callback)(void *data), void *data, u32 *tre_ch);
 138
 139 void hidma_ll_free(struct hidma_lldev *llhndl, u32 tre_ch);
 140 enum dma_status hidma_ll_status(struct hidma_lldev *llhndl, u32 tre_ch);
 141 bool hidma_ll_isenabled(struct hidma_lldev *llhndl);
 142 void hidma_ll_queue_request(struct hidma_lldev *llhndl, u32 tre_ch);
 143 void hidma_ll_start(struct hidma_lldev *llhndl);
 144 int hidma_ll_disable(struct hidma_lldev *lldev);
 145 int hidma_ll_enable(struct hidma_lldev *llhndl);
 146 void hidma_ll_set_transfer_params(struct hidma_lldev *llhndl, u32 tre_ch,
 147         dma_addr_t src, dma_addr_t dest, u32 len, u32 flags, u32 txntype);
 148 void hidma_ll_setup_irq(struct hidma_lldev *lldev, bool msi);
 149 int hidma_ll_setup(struct hidma_lldev *lldev);
 150 struct hidma_lldev *hidma_ll_init(struct device *dev, u32 max_channels,
 151                         void __iomem *trca, void __iomem *evca,
 152                         u8 chidx);
 153 int hidma_ll_uninit(struct hidma_lldev *llhndl);
 154 irqreturn_t hidma_ll_inthandler(int irq, void *arg);
 155 irqreturn_t hidma_ll_inthandler_msi(int irq, void *arg, int cause);
 156 void hidma_cleanup_pending_tre(struct hidma_lldev *llhndl, u8 err_info,
 157                                 u8 err_code);
 158 void hidma_debug_init(struct hidma_dev *dmadev);
 159 void hidma_debug_uninit(struct hidma_dev *dmadev);
 160 #endif